The hex color #b4020c is a dark color. The web-safe version is Hex
#CC0000. A complementary color is
#4BFDF3. The grayscale version is
#414141. A 20% lighter version of the original color is
#E7353F, and Hex
#810000 is the 20% darker color. If the color is saturated by 10%, you get
#C00007. If the color is desaturated by 10%, the color
#A80811 is obtained.